The only mods I have on my truck so far are a BHAF and a Rokktech sensor. Have been thinking about a TST PowermaxCR. On the highway not hauling anything I can get 20-23mpg depending on hills and speeds. If I had the TST and ran maybe a 2/2, how would that affect mileage? I'm not after it for mileage only but when I haul my racecar and some of the steep grades. I'm still in the racing mode when I leave the track 
